CN102563701B - Premixing nozzle - Google Patents

Premixing nozzle Download PDF

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Publication number
CN102563701B
CN102563701B CN201110365813.7A CN201110365813A CN102563701B CN 102563701 B CN102563701 B CN 102563701B CN 201110365813 A CN201110365813 A CN 201110365813A CN 102563701 B CN102563701 B CN 102563701B
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CN
China
Prior art keywords
central body
device module
mixed conjunction
mixing nozzle
conjunction device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201110365813.7A
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Chinese (zh)
Other versions
CN102563701A (en
Inventor
G·D·迈尔斯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of CN102563701A publication Critical patent/CN102563701A/en
Application granted granted Critical
Publication of CN102563701B publication Critical patent/CN102563701B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23RGENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/286Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23RGENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/30Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising fuel prevapourising devices
    • F23R3/32Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising fuel prevapourising devices being tubular
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23RGENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/36Supply of different fuels

Abstract

A premixing nozzle (10) of a combustor is provided and includes a gas premixer module (20), a centerbody (30), which is breech-loadable into the gas premixer module (20) and a deformable, compliant interface (40) between the gas premixer module (20) and the centerbody (30).

Description

Pre-mixing nozzle
Technical field
Theme disclosed herein relates to the pre-mixing nozzle for the burner in low emission industrial gas turbine.
Background technology
In the combustion system (being sometimes called dry low NOx (DLN) burner) of low emission gas-turbine unit, premixed air and fuel are being placed in the burner combustion of turbine upstream, in turbine, from burning, the high temperature fluid produced obtains mechanical energy.Then electric energy generates from mechanical energy and is transferred to circuit.Burner typically comprises the fuel nozzle with premixed path, and in premixed path, air and fuel are mixed with each other.Carry out this premixed to reduce peak flame temperature in burner and to reduce the formation of nitrogen oxide (NOx) in waste gas streams.
In order to fuel flexibility and power system availability, low emission gas turbine is usually equipped with and sprays the system of oil as secondary or guarantee fuel, supplementing as gas pre-mixed conjunction device.This oil ejector inserts typically via the center of gas pre-mixed conjunction device, and oil spurts outlet is communicated with burner reaction zone.Do not evaporate before combustion due to oil fuel and do not mix with air, but be directly injected in reaction zone, therefore large water gaging (when large-scale power generating turbine every day hundreds thousand of gallon) must be ejected in reaction zone to reduce flame temperature and the NOx emission level to manager's defined.In fact, current method usually needs directly to spray than the more water of fuel to reach the NOx level of the close 42ppm be generally expected to when oil fuel is lighted a fire.
And, load in (breech-loaded)/oil box/gas pre-mixed conjunction device assembly at current breech, all at one end support rigidly and the concentric tube pipe nested with one another moved freely toward each other at far-end.During turbine operation, the far-end of pipe tends in response to the wide range noise produced by gas-turbine unit and vibrates and contact with each other.Therefore pipe and nozzle tip component tend to heavy wear and fretting between mating parts.
Summary of the invention
According to an aspect of the present invention, provide a kind of pre-mixing nozzle of burner, it comprises: gas pre-mixed conjunction device module; Central body, it can be encased in gas pre-mixed conjunction device module at breech; And the deformable compliance interface (compliant interface) between gas pre-mixed conjunction device module and central body.
According to a further aspect in the invention, provide a kind of pre-mixing nozzle with the burner of end cap, it comprises: gas pre-mixed conjunction device module, and it is installed on end cap; Central body, it can be encased in gas pre-mixed conjunction device module at breech by end cap; And the deformable compliance interface between gas pre-mixed conjunction device module and central body.
According to another aspect of the invention, a kind of pre-mixing nozzle of burner is provided, it comprises: outer body, it has outer ring guard shield and inner annular wall, outer ring guard shield is formed as limiting premixed chamber, and inner annular wall is formed as being limited to the premixed path of upstream, premixed chamber between the outer surface and outer ring guard shield of inner annular wall; Central body, it is encased in the breech that limited by inner annular wall, with delivery of fuel to premixed path; And potted component, it is positioned to for being radially plugged between the internal diameter of inner annular wall and the external diameter of central body, with in breech internal support central body.
Following description in conjunction with the drawings, these and other advantage and feature will become more obvious.
Accompanying drawing explanation
Be considered to theme of the present invention point out especially in the claim appended by description and advocate clearly.The following detailed description in conjunction with the drawings, aforementioned and further feature of the present invention and advantage will obviously, in the accompanying drawings:
Fig. 1 is the sectional view of gas pre-mixed conjunction device module;
Fig. 2 is the sectional view of central body;
Fig. 3 is the central body of Fig. 1 is encased in the gas pre-mixed conjunction device module of Fig. 1 sectional view at breech;
Fig. 4 is the perspective view of potted component; And
Fig. 5 to Fig. 7 is the perspective view of time potted component.
Describe in detail and explain embodiments of the invention in the illustrated manner referring to accompanying drawing, and advantage and feature.
List of parts:
10 pre-mixing nozzles
20 gas pre-mixed conjunction device modules
21 outer ring guard shields
22 inner annular walls
23 upstream extremities
24 midstream section
25 downstream
26 premixed chambeies
27 air intakes
28 premixed paths
30 central body
32 mounting flange ends
33 diffusion tips
34 middle bodies
35 fuel inlets
40 potted components
41 honeycomb seals
50 mounting flanges
51 structural poles support columns (structural stem support tube)
55 breech
60 air cyclones
65 air ejectors
66 potted components
67 purge film path
70 c shape seals
71 c shape seal body
72 axial c shape seals
73 axial c shape seal body
74 surpass c shape seal
75 surpass c shape seal body
Detailed description of the invention
The internals of the pre-mixing nozzle of burner uses welding, soldering, is threaded, Cone fit or the contact surface size that increases simply and support in cantilever fashion, or is supported extraly along its length by potted component.The different heat between central body from gas pre-mixed conjunction device module is allowed to grow, damping simultaneously and damping vibration.Potted component does not provide strong thermally conductive pathways between the modules, and therefore helps the liquid-fuel wetted surface in isolation central body.
Referring to Fig. 1 to Fig. 3, provide the pre-mixing nozzle 10 of the burner with end cap, this pre-mixing nozzle 10 comprises outer body, such as gas pre-mixed conjunction device module 20; Central body 30 and potted component 40.
As shown in Figure 1, gas pre-mixed conjunction device module 20 has outer ring guard shield 21 and inner annular wall 22.Outer ring guard shield 21 extends past midstream section 24 from upstream extremity 23 and arrives downstream 25.In downstream 25, outer ring guard shield 21 is formed as limiting premixed chamber 26 therein.At upstream extremity 23, outer ring guard shield 21 and inner annular wall 22 limit air intake 27 collaboratively, and compressor is discharged air and entered gas pre-mixed conjunction device module 20 by air intake 27.Along midstream section 24, outer ring guard shield 21 and inner annular wall 22 limit premixed path 28 collaboratively, combustible fluid premixed before entering premixed chamber 26 in premixed path 28.
In the upstream of upstream extremity 23, other component comprises mounting flange 50, structural poles support column 51 and air cyclone 60.Mounting flange 50 supports the installation of pre-mixing nozzle 10 in the burner, and structural poles support column 51 extends to upstream extremity 23 from mounting flange 50.Concentric cartridge and flue are defined in mounting flange 50 and structural poles support column 51.
Central body 30 can be encased in the breech 55 that limited by mounting flange 50, structural poles support column 51 and inner annular wall 22, and is configured to delivery of fuel, and such as drying oil, liquid fuel, purging air and/or gaseous fuel, at least to premixed path 28.Can via the fuel injector bores be formed in the external diameter of central body 30 and inner annular wall 22, such as liquid fuel atomization device, realizes sending.Central body 30 has tubular form substantially and for hollow, makes fuel transmissibility to its inside 31.
As shown in Figure 2, central body comprises mounting flange end 32, diffusion tip 33 and middle body 34.Middle body 34 is axially inserted between mounting flange end 32 and diffusion tip 33.Central body 30 is also included in liquid and the purging air/gas fuel inlet 35 at mounting flange end 32 place, and on end cap, sentence cantilevered fashion supporting at least in part in mounting flange end 32.In addition, at least the inside 31 of central body 30 is communicated with the combustion zone of burner via the opening being formed at diffusion tip 33 place.
When central body 30 supports in cantilever fashion in end caps at least in part, potted component 40 is positioned between internal diameter for being radially inserted in inner annular wall 22 and the external diameter of central body 30.In this position, potted component 30 provides additional support to the central body 30 in breech 55.The character of the relative compliance of larger contact surface sum of potted component 40 also serve as damper to reduce experienced by gas module and liquid modular assembly relative movement, fretting and vibration stress level, thus the component's life of the durability be improved and prolongation.
As shown in Figure 3, potted component 40 is installed in inner annular wall 22 by the cohesive process of welding, soldering, metallurgical binding or certain other type.Inserted central body 30 by end cap, breech 55 and potted component 40 and be encased in breech 55 by central body 30, wherein diffusion tip 33 is front end.When inserting completely, mounting flange end 32 is connected to end cap and the middle body 34 of central body 30 is supported near the midstream section 24 of gas pre-mixed conjunction device module 20 by potted component 40.
Referring to Fig. 4, potted component 40 can comprise the deformable and/or conforming materials that limit labyrinth seal and/or honeycomb seals 41.In this way, the supporting of central body 30 can be provided, and can not make to support can cause fretting for rigidity causes by huge rotary turbine or the normal vibration that produced by burning induction dynamic pressure oscillations (be usually referred to as combustion noise or burning dynamically), contact surface weares and teares or ftractures due to fatigue.That is, the compliance of potted component 40 and deformability are used for the Relative Vibration of damping between central body 30 and gas pre-mixed conjunction device module 20, make allow some vibration but avoid causing the contact between the central body 30 of these component damage and gas pre-mixed conjunction device module 20.Potted component 40 also can be formed by the material with low heat conductivity, the heat transfer between gas pre-mixed conjunction device module 20 and central body 30 is restricted and the liquid in central body 30-fuel wetted surface can be isolated with the convection current absorbed by the air cyclone in gas pre-mixed conjunction device module 20.
Referring to Fig. 1 and Fig. 3, outer ring guard shield 21 also can be formed as limiting compressor in the position of the axial upstream of premixed path 28 and discharge air ejector 65.The air cyclone 60 of outer ring guard shield 21 can be placed in compressor and discharge in the downstream of air ejector 65 and the upstream of premixed path 28 or premixed path 28.Outer ring guard shield 21 also can comprise time potted component 66.Secondary potted component 66 is positioned to for being radially inserted between air cyclone 60 and central body 30, to provide additional support to the central body 30 in breech.
As shown in Figure 3, the inner radial portions of air cyclone 60 is divided and radially can be shifted with the external diameter of central body 30, and secondary potted component 66 can be discharged air ejector 65 with compressor and is axially shifted.This is arranged, purging film path 67 can be formed and enter gas pre-mixed conjunction device module 20 for compressor discharge air (CPD) by compressor discharge air ejector 65.Radially-inwardly flowing along compressor discharge air ejector 65 at least partially of the compressor discharge air of premixed path 28 is not entered immediately via air cyclone 60, thus impact central body 30, and then allow it flow to premixed path 28 before along the external diameter of central body 30 towards secondary potted component 66 axial flow.
Avoid the flame backfire that caused by tail, Thick Boundary Layer and other weak Secondary Flow in premixer by purging the CPD film that provides of film path 67, wherein local mixing speed is lower than turbulent flame speed.When attempting evaporation and premixed diesel fuel, when without film, this will be difficult especially, and diesel fuel is lighted in large approximate number millisecond automatically when it arrives the temperature higher than about 400 degrees Fahrenheit to 500 degrees Fahrenheits.CPD film sweeps away any liquid oil may come on these surfaces, thus avoid solid carbon formation, this solid carbon may tackle premixer air stream, thus forming Thick Boundary Layer and the post-depositional tail of solid carbon, it will cause premixed flame to spread in premixed annular space and burn the part not being designed for the system of flame.Therefore, for premixed oil firing, avoid the needs that originally will be used for the water of millions of gallons that NOx controls.The ability utilizing CPD film to purge boundary layer and be directly installed to by liquid fuel injector in central body 30 is provided extraly.
Referring to Fig. 5 to Fig. 7, secondary potted component 66 can comprise following in one or more: c shape seal 70, it has c shape seal body 71, and wherein c tee section is open upwards (referring to Fig. 5) in downstream side; Axial c shape seal 72, it has axial c shape seal body 73, and wherein c tee section radially outward opens wide (referring to Fig. 6); And super c shape seal 74, it has super c shape seal body 75, and wherein the butt curl of seal is in each other and towards updrift side (referring to Fig. 7).
Although only describe the present invention about a limited number of embodiment, should be easy to understand the present invention and be not limited to embodiment disclosed in these.But, the present invention can be revised with the modification of any object do not described before merging, change, alternative or equivalent arrangements, but these still conform to the spirit and scope of the present invention.In addition, although describe various embodiment of the present invention, should be appreciated that some that aspect of the present invention can only comprise in described embodiment.Therefore, the present invention should not regard as and limit by description above, but only limits by the scope of claims.

Claims (10)

1. the pre-mixing nozzle (10) of a burner, comprising:
Gas pre-mixed conjunction device module (20);
Central body (30), it can be encased in described gas pre-mixed conjunction device module (20) at breech; And
Deformable compliance interface (40) between described gas pre-mixed conjunction device module (20) and described central body (30);
Wherein, described gas pre-mixed conjunction device module extends through midstream section (24) from the upstream extremity (23) of described pre-mixing nozzle, described gas pre-mixed conjunction device module comprises outer ring guard shield (21) and inner annular wall (22), described in described upstream extremity place, outer ring guard shield and described inner annular wall define air intake (27), and described in described midstream section place, outer ring guard shield and described inner annular wall define premixed path (28);
Wherein, described deformable compliance interface is arranged on described midstream section place, to support Relative Vibration between described central body and described gas pre-mixed conjunction device module of described central body and damping and wearing and tearing.
2. pre-mixing nozzle according to claim 1, is characterized in that, also comprises: mounting flange (50), structural poles support column (51) and air cyclone (60).
3. pre-mixing nozzle according to claim 1, is characterized in that, between the internal diameter that described deformable compliance interface is installed on described gas pre-mixed conjunction device module (20) and the external diameter of described central body (30).
4. pre-mixing nozzle according to claim 1, is characterized in that, described central body (30) comprising:
Mounting flange end (32);
Diffusion tip (33); And
Middle body (34), it is axially inserted between described mounting flange end (32) and described diffusion tip (33), and axially aligns with described deformable compliance interface.
5. one kind has the pre-mixing nozzle (10) of the burner of end cap, and described pre-mixing nozzle (10) comprising:
Gas pre-mixed conjunction device module (20), it is installed on described end cap;
Central body (30), it can be encased in described gas pre-mixed conjunction device module (20) at breech by described end cap; And
Deformable compliance interface (40) between described gas pre-mixed conjunction device module (20) and described central body (30);
Wherein, described gas pre-mixed conjunction device module extends through midstream section (24) from the upstream extremity (23) of described pre-mixing nozzle, described gas pre-mixed conjunction device module comprises outer ring guard shield (21) and inner annular wall (22), described in described upstream extremity place, outer ring guard shield and described inner annular wall define air intake (27), and described in described midstream section place, outer ring guard shield and described inner annular wall define premixed path (28);
Wherein, described deformable compliance interface is arranged on described midstream section place, to support Relative Vibration between described central body and described gas pre-mixed conjunction device module of described central body and damping and wearing and tearing.
6. pre-mixing nozzle according to claim 5, is characterized in that, also comprises: mounting flange (50), structural poles support column (51) and air cyclone (60).
7. pre-mixing nozzle according to claim 5 (10), is characterized in that, described central body (30) comprising:
Mounting flange end (32);
Diffusion tip (33); And
Middle body (34), it is axially inserted between described mounting flange end (32) and described diffusion tip (33), and axially aligns with described deformable compliance interface (40).
8. pre-mixing nozzle according to claim 7 (10), is characterized in that, described central body (30) is included in the liquids and gases fuel inlet (35) at described mounting flange end (32) place.
9. pre-mixing nozzle according to claim 7 (10), is characterized in that, described central body (30) sentences cantilevered fashion supporting described mounting flange end (32) on described end cap.
10. pre-mixing nozzle according to claim 7 (10), is characterized in that, the inside of described central body (30) is communicated with the combustion zone of described burner via described diffusion tip (33).
CN201110365813.7A 2010-11-03 2011-11-03 Premixing nozzle Expired - Fee Related CN102563701B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/938,899 US9010119B2 (en) 2010-11-03 2010-11-03 Premixing nozzle
US12/938899 2010-11-03

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CN102563701A CN102563701A (en) 2012-07-11
CN102563701B true CN102563701B (en) 2015-07-15

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US (1) US9010119B2 (en)
JP (1) JP5960968B2 (en)
CN (1) CN102563701B (en)
DE (1) DE102011054859A1 (en)
FR (1) FR2966908A1 (en)

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Publication number Publication date
JP2012098022A (en) 2012-05-24
US9010119B2 (en) 2015-04-21
FR2966908A1 (en) 2012-05-04
DE102011054859A1 (en) 2012-05-03
US20120102957A1 (en) 2012-05-03
JP5960968B2 (en) 2016-08-02
CN102563701A (en) 2012-07-11

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